I have an update on this: I've got the drawings done, and I have a guy building a solidworks file. It will be compatible with RED V-Mount, IDX, & A/B Plates; RED and Element Technica V-Wedge adapters, RED & Wooden Camera A-Mount adapters, 9mm spaced 1/4-20 accessories (standard RED spacing). It will also have 1" on-center 10-32 tapped holes (Berkey System AKS), and some 3/8-16 tapped holes. It will come with six custom designed Anton/Bauer posts that will screw into the plate.
You will have the ability to screw two plates together, clamping accessories in between. This will be good for converters like the Blackmagic Mini Converters that don't have mounting points.
I'm also in the process of designing accessories that will be able to be clamped in between two plates; like a power distro.